Freequeue is web-based software and you can buildhardware according to your budget and needs. Here are some purchasing tips.
For an entry level solution with no more than 3 speakers, we recommend a 16" touch screen connected to a media point. Depending on your needs, you can opt for a minipc or an rpi.
Below are direct links to products we use on our queue machines:
This all-in-one solution is for those who want to implement a dispenser for a single till.
It involves the use of a 7" screen integrated directly into a raspberry. You won't need anything else!